Физика Низких Температур: Том 27, Выпуск 4 (Апрель 2001), c. 430-435    ( к оглавлению , назад )

Spontaneous magnetostriction in the Gd-Y system: analysis of phase transformations

A. B. Beznosov, E. L. Fertman, V. V. Eremenko, and P. P. Pal-Val

B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61164, Ukraine
E-mail: beznosov@ilt.kharkov.ua

V. P. Popov and N. N. Chebotayev

V. N. Karazin Kharkov National University, 4 Svoboda Sq., Kharkov 61077, Ukraine

Received December 11, 2000

Аннотация

The transformations of magnetic and lattice subsystems states of Gd100-xYx (x=0, 5.5, 7.5, 10.2) alloys have been studied at temperatures 5-370 K in magnetic fields up to 4 kOe. The temperature dependences of elastic modules, thermal expansion, low field magnetization and magnetic anisotropy parameters were obtained. The linear spontaneous striction DL(T)/L=xh2 was analized, and the effective order parameters h and magnetostrictive parameters x were evaluated for the four magnetic phases (canted ferromagnetic, deforming ferromagnetic helix, ferromagnetic helix, and the ferromagnetic cone, respectively): xcf=2.2×10-5, xdh=- 5.3×10-5, xfh=7.1×10-5, xfc=1.4×10-3.

PACS:
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
75.50.√y -